It looks like the Cyanogenmod team, in a continued effort to bring continually-updated Gingerbread goodness to as many devices as possible, have brought nightlies to a new crop of handsets, including AT&T's variant of the Samsung Galaxy SII, the Motorola Atrix, LG's Optimus Black and a handful of Sony devices including the Xperia X10, Play, Arc (X12), X10 mini, ST18i, and about five others.

Update: Here are some of the popular device/codename mappings (mapping these took a significant and unnecessary amount of time.